ROAD METAL AND BREAKING.
Test of fitness of stone -- Primary investigations -- Qualities
necessary -- List of stones used as road metal -- Variety of materials
used -- Table of comparative efficiency of road metal in France --
Hand-broken stone -- Gauging the size -- Quantity broken per diem --
Machines for breaking stones -- Price of machines -- Work effected by
machinery -- Precautions necessary -- Objections to machinery --
Weight of broken stone -- Specification for supply of road metal 48